I have resisted this as I sort bullets for my long range PB shooting, not my favorite task. So yesterday I sorted 2 different pellets. First thing I learned......It's laughable they even mark a size on the tin. One tin I it took over 50 pellets to find one as labeled. The other tin it took over 20. Second thing I learned. There was a size my. 177 TX200 preferred. Third, different sizes have a different POI. The difference is small but it does add to your group size shooting unsorted. Overall opinions, first pellets are junk.....secondly for optimum performance it is a must. These were both the same brand, I will try some others. I expect I will get similar results.